The calculated distance (air line) between Arlesheim and La Chaux-de-Fonds is approximately 46 miles respectively 74 kilometers.
By car or train, the actual journey to La Chaux-de-Fonds is certainly longer, as only the direct route (as the crow flies) between Arlesheim and La Chaux-de-Fonds has been calculated here.
Air line (approximately)
74 kilometers
40 nautical miles